CVE-2025-40004 (GCVE-0-2025-40004)
Vulnerability from cvelistv5
Published
2025-10-20 05:26
Modified
2025-10-20 05:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/9p: Fix buffer overflow in USB transport layer A buffer overflow vulnerability exists in the USB 9pfs transport layer where inconsistent size validation between packet header parsing and actual data copying allows a malicious USB host to overflow heap buffers. The issue occurs because: - usb9pfs_rx_header() validates only the declared size in packet header - usb9pfs_rx_complete() uses req->actual (actual received bytes) for memcpy This allows an attacker to craft packets with small declared size (bypassing validation) but large actual payload (triggering overflow in memcpy). Add validation in usb9pfs_rx_complete() to ensure req->actual does not exceed the buffer capacity before copying data.
References
Impacted products
Vendor Product Version
Linux Linux Version: a3be076dc174d9022a71a12554feb4c97b5c4d5c
Version: a3be076dc174d9022a71a12554feb4c97b5c4d5c
Version: a3be076dc174d9022a71a12554feb4c97b5c4d5c
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: Fix buffer overflow in USB transport layer\n\nA buffer overflow vulnerability exists in the USB 9pfs transport layer\nwhere inconsistent size validation between packet header parsing and\nactual data copying allows a malicious USB host to overflow heap buffers.\n\nThe issue occurs because:\n- usb9pfs_rx_header() validates only the declared size in packet header\n- usb9pfs_rx_complete() uses req-\u003eactual (actual received bytes) for\nmemcpy\n\nThis allows an attacker to craft packets with small declared size\n(bypassing validation) but large actual payload (triggering overflow\nin memcpy).\n\nAdd validation in usb9pfs_rx_complete() to ensure req-\u003eactual does not\nexceed the buffer capacity before copying data."
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      "providerMetadata": {
        "dateUpdated": "2025-10-20T05:26:08.787Z",
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    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2025-10-20T05:26:08.787Z",
    "state": "PUBLISHED"
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